(NORTH ADAMS, Mass.) – Trad-country-rocker Dwight Yoakam, bluegrass legends the Del McCoury Band, Indiana alt-country rockers Houndmouth, Malian singer-songwriter and multi-instrumentalist Vieux Farka Touré, jam-band avatars Leftover Salmon, Boston-based trio the Ballroom Thieves, and acoustic roots band Cat and The Moon, and The Man in Grass, an all-star tribute to Johnny Cash, headline Freshgrass, the annual three-day bluegrass…